Sheet-metal sprocket-rim.



W. H. BRISTOL.

SHEET METAL S PROOKET RIM. APPLICATION FILED JUNE 26, 1213.

1,098,473, Patented June 2, 1914.

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WILLIAM H. BRISTOL, 0F WATERBUEY, CONNECTICUT, AfiSIIZ'rNEJR TO THEBRIS'Z'GL COMPANY, OF WATERBURY, CONNECTICUT, A CORPORATION OFCONNECTICUT.

SHEET-METAL SPROCKET-RIM.

To all whom it may concern:

Be it known that T, WILLIAM H. BRISTOL, a citizen of the United States,and resident of Waterbury, in the county of New Haven and State ofConnecticut, have invented certain new and useful improvements in Sheet-Metal Sprocket-Rims, of which the following is a specification.

The invention relates to sprocket wheels, and more particularly towheels in which the rim is stamped up from sheet metal in the form of atoothed band suitable for attachment to a wheel or shaft.

The invention has for its object to readily and inexpensively stamp upbands of suitable material and of various lengths having teeth formedintegrally therewith, and which bands may be attached to wheels andshafts of various diameters, the pitch of the teeth for a given chainbeing suited to the diameter of a wheel or shaft.

A further object of the invention is to so arrange the teeth of the saidband that the edges of the same lie substantially in the direction ofits length, thereby affording teeth of maximum strength.

in the accompanying drawings which illustrate the invention-Figure 1 isan elevation of a wheel to which the sprocket band has been attached andof a chain engaging the same. Fig. 2 is a plan thereof. F i g. 3 is atransverse section, on an enlarged scale, and taken on the line 3-3,Fig. 2, the chain being omitted. Fig. 4 is an enlarged plan of thesprocket band and teeth, the former being shown flattened to lie in aplane.

Similar characters of reference designate corresponding parts throughoutthe several views.

Referring to the drawings, 10 designates a band of sheet metal, somewhatflexible and of the requisite strength. The same is provided at variouspoints along its length with perforations 11 through which suitablenails, screws or bolts may be brought to attach it to a support, forexample, a wooden or metal wheel 12 as shown. From the band 10 there arecut transversely to its length, and pref- Specification of LettersPatent.

Application filed .Tune 26, 1913.

Patented June 2, 1914.

Serial No. 775,839.

crably in pairs, teeth 13 in the form of spurs projecting upwardly atpredetermined intervals along the band, the said intervals beingdetermined with respect to a given chain 1-1 by the diameter of thewheel 12 to which the band is to be secured. If the metal be ofsu'liicient thickness and strength, single spurs may be employed asteeth instead of pairs of spurs. The size of the teeth in either caseremains the same for most purposes, but their pitch is varied asaforesaid. The spurs forming the teeth 13 and thus extending upwardlyfrom the said band are arranged to lie substantially in the direction ofthe band and are tapered to provide the desired cont-our of the tooth.The tips of the corresponding spurs of the various teeth are,furthermore, preferably turned over to meet each other to reinforce theteeth, which, moreover, in view of the edge-wise arrangement are ofmaximum strength with respect to the amount of material employed. Teethof such shape, also, readily engage with the links of the chain 14 anddo not tend to interfere therewith when coming into engagement, allowingthe chain to run at a high rate of speed.

I claim 1. A sprocket having a rim consisting of a flexible band ofsuitable material adapted to conform to and to be attached to a support, and individual spurs integral therewith and extending upwardlytherefrom in pairs in the direction of its length and at predeterminedintervals along the band.

2. A sprocket having a rim consisting of a flexible band of suitablematerial adapted to conform to and to be attached to a sup port, andoppositely disposed coacting spurs integral therewith and extendingupwardly therefrom in the direction of its length and at predeterminedintervals along the band and the tips of the pairs of spurs being turnedover to meet each other.

3. A. sprocket having a rim consisting of a flexible band of suitablematerial adapted to conform to and to be attached to a support, andoppositely disposed coacting spurs integral therewith and extendingupwardly New York, and State of New York, this therefrlom in the1directiolli ofl its iellilgtill) mild 24th day of June, A. D. 1913. atprec etermine interva s a 011g t e an the said spurs being suitablytapered anci WILLIAM BRISTOL 5 the tips of the various pairs thereofturned 'Witnesses:

over to meet each other. FREDK. F. SOHUETZ,

Signed at New York, in the county of LAURA E. SMITH.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

